From Matthew Dobson <colpatch@us.ibm.com>

"This patch adds a 'simple' in-kernel topology API.  This API allows
 for three primary topology elements: CPUs, memory blocks, and nodes.
 The API allows for the discovery of which CPUs/Memory Blocks reside on
 which nodes, and vice versa.  Also implemented is a macro to get a
 bitmask of CPUs on a particular node.  This API is platform neutral."

We need this API for per-node-kswapd - without it there is no means by
which each kswapd can be bound to its node's CPUs.  And we rather need
per-node-kswapd...

The patch also uses the new API to bind each kswapd instance to its
node's CPUs